Pendulum level



Aug. 19, 1924. 1,5056@ R. C. BAIRD PENnULUM LVEL med Nov. 1e. 1923Patented Aug. k19, 1924.

UNITE sr'res f PENDLUM Lnvnn. y

Application filed November 18, 1923. kSeria! N80. 675,065.

To all whom t may con-cem: f

Be it known that RoswnLL C. Bann), a citizen of the United States,residing at Curnberland, in the county of Barron and `State of1IWisconsin, has invented certain new and useful Improvements inPendulum Levels, of which the following is a specification.

This invention is in the way of a gravity degree level, and the objectof the invention is to provide a inechanics level and plumb, wherein apivoted and weighted pointe-r or indicator is employed instead of aglass tube illed with alcohol or the like. lt. is claimed that theinstrument constructed in accordance withv thisV invention will givemore accurate and reliable results, and will not so easily get out oforder as the spirit level.

ln the drawing Figure 1 is a side elevation; Figure 2 is a top view;Figure is a medial, transverse section.' The invention is incorporatedin the usual elongated, rectangular bevel block ork stock 1a In carryingout the invention. a round housing` aperture 2 is formed transverselythrough the center of the stock 1, and elongated sight slots 3 are cutdown through the two edges of the stock into the aperture 2. Acylindrical indicator lio-using 14- is firmly seated through theaperture 2, the said housing having at opposite sides sight slots 5 inregister' with the slots 3 of the stoel: 1. A nnular shoulders 6 areformed at each end of the cylindrical housing il adapted to engage andhold transparent disc crystals 7.

Metal indicator collars 8, having degreer marks 9 stamped thereon, arethen mounted over the crystals 7- and secured to the stock 1 by screws10. Shaft holes 11 are formed through the exact centers of the crystals'7 and supporting 'shafts 12 are mounted through these holes from eachside ofthe stock 1. This mounting is accomplished by threading the outerend of each of the Vshafts 12 at the point where they pass through thecrystals, and then placing twov nuts 13 and 14 on each of these ends,one on the inner side of the crystal and one on the outer side thereof,thus locking the shafts rigidly perpendicula-rly and adjustably to thecrystals. Balls 15 are formed on the inner ends of the shafts 12. Anindicator arrn 16 is weighted at its lower end 17, po'inted PATENTRosa/'ELL o. Brunn, or currnnnnann, Wisconsin. 1

at its upper end 18, and formed with medial f 19 adapted i oppositelydisposed 'sockets to be engaged by the balls 15 the shafts 12, wherebythe indicator arm 15 is supported pivotally in position betweentheshafts 12. By a proper adjustment of the nuts 13 and 14 and oiling thebearings of the arm 15, the latter may be made to swing freely andsteadily. The use and 'operation of the device is apparent frei-n thefore-going description.

lVhile l have vherein described a certain i specific manner and methodof constructing andasseinblingthe elements of my invention, itisunderstoodv that I may vary from the same in minor details, notdeparting from the spirit of my invention, so as best to construct apractical device for the purpose intended, as deiined in the appendedclaim.

I claimt:

A device of .the kind described, comprisingw a bevel stock having around, medial, transverse housing aperture with sight slots openingthereinto from top and bottom of the, stock; a cylindrical indicatorhousing mounted within the said aperture, the said housingrhaving..sight slots registering with ythe sight slots of the stock; adisc crystal l n'iounted at each end of the saidhousing, the

said `crystals rhaving shaft holes formed centrally therethrough;calibrated collars mounted over the edges of each of said crystals andsecured to the stock; supporting shafts mounted throughr the shaft holesofl 'the crystals, the said shafts being threaded at the outer endspassing through the rcrystals and each havinga aball formed on its innerend; yadjustment nuts on the threaded ends of the supporting shafts, one

vinside andy one outside each. crystal; and an indicator arm. weightedat one end and `pointed at the other pivoted' between the ball-likeinner ends of the supporting shafts,

, RO'SWELL C. BAIRD.

Witnesses: y

Lnwis LARsoN, VALENTINE L. EWALD.

